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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09c6cf6f2b4322ad0a4740bb563b735e4ff8a2bcf81ef5c244e9e0d380f3b7a' 
  AND token = 'dk6Rvz5snZWGk+m708vcPUTLdfRRM2WIj99D3EYTS/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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