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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4abb3f538465a698cc1fc46d99b21cc588c01f9210bd1c36cc40c74534a911e5' 
  AND token = 'k8B/Vvs13eSG64bXxrX1fHa21oSI/gA5bJkZdnMTZNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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