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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee99749bdbbecd8b67f0be85394a3ff7e3ded6ee183db575031e02e23ee1b50' 
  AND token = 'hGlj30roptJ7iO2IVDIa95YM84UV1UIBHgZ1dR1tviM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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