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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61bd0313ef5856a5babc3a04dcf0c90a8f5626a18729558e10fa4eac5c2fb695' 
  AND token = 'HIUaoL3TCPBd8TExYBuIzReAgXF3ntmL8zl6Jv3/duw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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