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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6f335c5a2752d0f47aae488a98c2c4e9593fa30db0509260179fd7582ddcbce' 
  AND token = 'Cz2EyR+Y5MONTUcWmRbakWb3BiR1cHlc/z18rqcCTh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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