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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b31a1eb2e4d6ed33aea8fd458aba600f36b270f52e393ed79a7d60e35b843a3' 
  AND token = 'UP4tKKQlG4J10528koiwklWdML7pvEe5g045zasqPjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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