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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb811ece9326a2981f6635ef89f685b1cce38c4be6c5a4e4d77f3d63efea066e' 
  AND token = '1bu6HeLPBNFDUANZEWlEc3Lah9O3MgPs4dIjqOYchjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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