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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52c22c9a6b30fe53b274be0555d4fa969c3592392c030d507c4d40e80d3e55ff' 
  AND token = 'wvfWLx8fe0BGVJ9IdQu9lRpDKhJiLimeSylEoE6IZfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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