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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532b16152febfca39a32ed620f01de7b0f3cf6bd10a991d84c61284342002d5c' 
  AND token = 'Ck89y5vMkADAmkPXnwU0lfR4Z1lcwqj+z9Ya7TBUqrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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