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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed9d2e6b4ae8bc3c8faef45ba5c70caa0b07c685c1b70ee645e767c8905699fb' 
  AND token = 'Cp3GlJiuvhwNVGWin+LR5tQxa5638xCz/t6Pppb2Prk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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