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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8dbf98ac8a2fcc34e00e5f95226ec48cef06bee51856db57ca36e286c0e4433b' 
  AND token = '7aSgBSe/kRe92edMdzpEc2v4jItjZmm7RG1AcBysBxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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