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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa9a4d22a4b1459610eb89965940effff7750c4b853e497dd77ed0ba5d903959' 
  AND token = 'dNHCWjd3K66Rl2PfcUHCCRXwCPbgVryJ+jAodl5kRHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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