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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7710b425b6ed63e74b2ff49fbc7f929d1afd2bdc6e64e82b61dcb966a2cf6df5' 
  AND token = 'JqCGSyd34sjiCJQlql2pTJrVPIdtjoWipfPyRuMucCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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