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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '507b05843e7c97aeead4c1e21d733f066853a2d61c14f4080210c9890e168807' 
  AND token = 'gMesKBg7mTY3YEIL88wC86kqBsyl0BAnVjlJeyw7TU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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