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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed1704bce69d414b6d571adf3906df374f62e293598efe7220de95b430a786bb' 
  AND token = 'LhMCgj1zk+9lnC3r8m4EWsFGM+oCOVgVtq4yuuo6MCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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