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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9d32d08d84a463faff5d3d1e3189570d2b0e3a7bb9aa2f65f0ca424e955e23b' 
  AND token = 'kJKZoBDRp9En+sBkYtJwGNqVOnHiD4zxyq5kdVlzde0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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