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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768cd27b94a238f7a91a05cb95ccdb780b5d9c64ac0dd5ea659ab00b95c11fd4' 
  AND token = 'ydOmtrkqDGqiba6nv3hbDQix9LPtW/Qv8vKn4HBg5KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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