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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ab49c8f4586312f987022af9ccfbd6cae1ef0b9bc10121885187f5f5151a235' 
  AND token = 'CK51S7ObNl98SzdTjVbDD/LlAULmXrjGTk5+u6jkKt8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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