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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5311a156a2ef951cf230d200cd1c07e0d0b1d9a8333c3d53e1d8c21d86d138e6' 
  AND token = 'pN1djZJXGPzmue6gpPrwBIbFpc1NHkichPp1DBoZ+v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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