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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6386b0c272dc0876641a6ba6cd79baa0d6fb9bd8a69071ab205187ff8a8b137f' 
  AND token = 'cuPEmkg7KU5gWAWg11Qtxq631GRWhe4oPn5dUVMmV8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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