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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26b75dcaa54caa9920d7b4096ddf49e0e87e27e127eff1a89727f4ca55fd5b1f' 
  AND token = 'gDFORo4aCaw6ONiNgj13XNLElJLCPU3ZE6VCp2kHjr0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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