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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbdd7e6bcdda70401e23de80d7932ca77fef6812ad547cc8512e1f1e07362203' 
  AND token = 'dIxnXljB5IMgQwtszALdlDF/7mAaWwAWJIpjQXSBaOA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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