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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc0482ff73352c3b5fc5211578aae622e62cc63fd1a30669f06b22209d24f0e' 
  AND token = 'zCagNgb8EwTr2SW/5Kdmuke0ZQHAf13TAyIhaZRhUfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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