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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b0cb839c165e5d3016bd89dfb56957dda72beb2dfe87d5205b0e7298a16997b' 
  AND token = 'RWnk3Runo9Jw9NWB3zKfJXZ5hUa2DN5LV4tNLdvM7uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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