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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95e25dba11f7e5aa92b37e55ea24fb23bba4c2a482baceaf0c4a9b2e787c0ded' 
  AND token = 'DEtbGcr/sW/ijO0DCkoutcL/SBVZhHOTLfCHwoBtg7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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