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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa414562d0727ed7dc945655e2cf715d3e7424b44e16debdd89ca52f46bab1e' 
  AND token = 'x2dD+8Fwe94rwfcQs5CrNRfJhviD5jmEBqWFbckld/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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