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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a30d3b9d4a7bc0e7d3d4fe6e2d2fd40773bb1c1d3fc1c1d730484ae308ccb81' 
  AND token = 'byzeqW4KkwogdE58VJADrrwP/O4RAZeiCOM6V2kb9tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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