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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f5069ebee0047c0a5c52fc4e33a7dc42143e8bf2150484900a7a026a9cb3f15' 
  AND token = 'SZc4hxeKMvwxsgznaRY5Mxt540m7pDsL4RNtF0idX80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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