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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1b69028329325741961b4780c9125d1f28dea3da1e1f3003368ed253c9b74b4' 
  AND token = 'TBlbgCo+kLO4vqqgOX6BicbpI7J2PyBPdjENqH7fl+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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