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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d08542323413a64b57e55f29ad8cc4ba26cb30e1130ad896cd86a39ff9fb4c2' 
  AND token = 'Oox0LM6iEM8alW6102rstTLXyaKTeKGgZPfeLffEe6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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