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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44dd7d1a922b43b32ecc443a7949aa71dec995866af89fc62cd2f3fa2b3d6e1f' 
  AND token = 'ITp568S15P6tX2yGt2wuYPYBd4yMCczgqv1nZRZidvM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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