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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3417b9f68c3af9b5a96f3391d54825c687f18c2387d05a9126c2051f95edfa21' 
  AND token = 'rXCm+ALauZKPqvDFPhcOnOMVkO6y6/24/FHOIkamCrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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