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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6db325a1e3f52a1818123c628dd7cd07dbae4a932dac48f290d2943f4a97b02e' 
  AND token = 'hnkcWmSiLZ2EHGr8KK4Ypp4sIdgz2UErJmJZ5ifE/MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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