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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9e86dc6a2049be947a0d77783e711468e0de27bc465944c49b08c409827841c' 
  AND token = 'Kx0ys1ye4b4bJosdZam+CXFRIiN7Wn9d7V45zBC+55s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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