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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f14d0257033a675fedcfc8f6c8d4c7827d05834a7a54d69fc0c5fbbfbd850df4' 
  AND token = '3kOx6/Lr69tFOHRflPJ0BRKAx9G/YwJ6QeRzvICLYRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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