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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b66a1c168649576cbc3ca6aa8819ad623cf6827212098342b1da4c8399adeb97' 
  AND token = 'pP3JkBtXxptZGHTeyogLWloOdHUrp68toQ1r5MrpPMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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