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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cff24e92a21c76382ee8ad93e8525a6ea2f272354f41d1a6cd70fc5d0c9b270' 
  AND token = 'azK2+AL7Mmdnkc/h6ElH9puAH9oi5vWS6ozBnaO61KE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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