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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6420867d3bebc080ddfa7e20a454284a2e8be33e38793637a58319c4c28a71a1' 
  AND token = 'FFoGSBr8KKjHMzDOubmh0y2Mcxrcn8mG4nnnOMEB3lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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