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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f21d3e4f39df03785def4edf2763088553b0dfb504720d8a270c07e42135949c' 
  AND token = 'wka3goeAq15vhnBg0QcSYccwpSYh7XvYbvXxyHLHhS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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