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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89edd2cd6afa03095b6147b2ebb741a03a1e415e6244e897e6b23da0691d361f' 
  AND token = 'bvZHDNaS44tPPPkfdeGiniwqG6lFwXtKfTMBjmNK8TY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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