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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7b1e0b314dbb6d789af5a215f0c155aa5f17c4890e0fa2cd1aa8f69436b6b9' 
  AND token = 'p1V7lIg7/ieXP1R5PZtqUzx80K/ra1zCVDWOgOD7pGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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