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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e116c31db5c057faf3c63e314e3964a9e934aa3f4a2b83775adf4db02ef64f0' 
  AND token = 'bsPLAxUl7qbu2mBeYRgJ4zpJPu7z+sBqbuM8hk0gThE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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