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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39d83409888c0a738dd7389e3b2b2487131524cc2e6195f3e9fc65039d8bcf46' 
  AND token = '/EK7BKIY5z+BY1Ec2hdCVMBeWD3oeRpYgx86HmDzjdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}