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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84ad92d07c8a1d451b2288257d3e4212e38c3f051c2f8a713494eae223dff0f' 
  AND token = 'zfk5xDoMDhdOhmywLlqU36tCa5KILEMEm7BZlFU2gDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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