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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e941f8d51f89c7e68dcf19a1317059ad3f4bd8f2951a638009d729f64b700d4c' 
  AND token = 'eyi6UV2mpk7bOJvorBL5+GWKdqChfEPyr8aR3QrldZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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