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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '335b775aad4b10b39b5c3c656da8af23e14b1c8c414deb366ebb72ef5402a10c' 
  AND token = '9nnahMipn8Asl4VNicMxpPJX+FEuptVnkPSpjNwSVCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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