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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db35cb3f6d0a2212e257957fce77856f7bbccf7365c6aad11b7d66f67b12fbd5' 
  AND token = 'xY0OnJ51JqoZr4A0uikMpxZ4uEwNLUMaTQu4If3fRe0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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