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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a83c07e4a800a40e22cd965c76dba4532582290620507d8490e474f139d7ad6' 
  AND token = 'ucqShI4JFX3NLNGEIVj2NW1BUEqNCgJdP1P36vv+vqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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