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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524a2866604e113fd49024eb62a67e8857ec89614a3d5c6f2aaf04b39d1489f9' 
  AND token = '/Wp2nP4rtEpVyZrKzFYUA2/2/CFExiIM4FVu7QxDy0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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