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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bee574447504fbeb565ebbce7ca520913d03f843868ab0dd7ba101a1f7084fa7' 
  AND token = '12dDXc5X7IArRapIs6I0j6eqAsjSHTAx8zj94Zprb6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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