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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe39fe8ee0cb23444aa5768861942a0f3efe4becc072e640c17257e1067f464a' 
  AND token = 'iNJqKW/XA+V6AG8Rbyx7ww/VYP50/a/hTqMVOhMBoYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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