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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fe9b85ad3cadff53755fb24699bd6ce02ef8a6986574f26fc5d6332472a19f0' 
  AND token = 'J/J2sqJMq0W7EnxeNzDhtIbCBn0Y7Z9iC/6o302roL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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