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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0321eff8f4bf6907791bf61c3c18eab283c72f215b95119b56258d0c4616059' 
  AND token = 'd9EnBKThQJeeKKd97g3jtMHnaKyFXr2QqAhLC5B0x+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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