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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd1e37f7bc228c7bc4ac13fd83d0e81fa3f0da3a70c5967c2a248003fdfe3686' 
  AND token = 'Lvr3jTjgKka2JDcD8aRksrVNHhQjlAVr4QC3eTsKn0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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