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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '935267b8c6f929376b9aacfe28e1f3b491281d6a0bf98f98d5478fdd44ac0e68' 
  AND token = 'YDQVRF9zY1RJZBiTVanXfiOA/t4UtDtR46WVCNPiGOo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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